08:29
Eons
Why Does Caffeine Exist?
It started with the production of one specific molecule and its ability to evolve.
- TV-Y7
Why We Only Have Ten Toes (It's a Long Story)
Join hosts Kallie Moore, Michelle Barboza-Ramirez, Gabriel Santos, and Blake de Pastino as they take you on a journey through the history of life on Earth. From the dawn of life in the Archaean Eon through the Mesozoic Era — the so-called “Age of Dinosaurs” -- right up to the end of the most recent Ice Age.
Why We Only Have Ten Toes (It's a Long Story)
Season 4 Episode 22 | 9m 12s | CC
Today, all mammals from humans to bats have five fingers or fewer. Yes, even whales, whose finger bones are hidden in their fins. Birds have four or fewer and amphibians get the best of both worlds, often having four digits on their “hands” and five on their “feet.” But no species of vertebrates have more than five digits, let alone eight!
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